How many GPUS can I accomodate on my gigabyte UD X570 motherboard ?

I have a amd ryzen 3 3200g On a gigabyte UD X570 Mobo So as per my understanding my processor has 20 PCIE lanes and Mobo has 16 So that's 36

And I have seen that my Mobo has 4 pcie slots (2×16 4.0/3.0, 2 x x1)

I have a 3070ti and a 3060ti currently , but looking to add atleast 4 more 3060tis or 3070tis to it

Accounting to a total of 6 GPUS on this rig

So how many can I accomodate on this rig the most ?